This study aims to explore the cognitive processing of unaccusative and unergative verbs in Turkish by means of self-paced reading. To this end, the study aims to examine not only the processing/passivization processes of unaccusative, unergative and accusative verb types but also whether the subject's ± animacy makes a difference in the processing of unaccusative verbs. According to the results of the study, compared to unergative and accusative verbs, unaccusatives create a higher processing load. The processing of unergative and accusative verbs are, on the other hand, similar. Focusing on the passivization processes of verb types, participants have processed the passive form of unaccusative verbs with both [-animate] subject and [+animate] subject in a longer duration than the passive form of unergative verbs. The analyses on the animacy of the subject of unaccusative verbs reveal that the [+animate] subject increases the processing time. The results also show that Perlmutter's (1978) Unaccusative Hypothesis regarding the distinction between unaccusative and unergative verb is valid.